Senior AI Engineers lead the development of AI-powered features, owning LLM integrations, agentic workflows, prompt design, and evaluation from design through production. They define AI integration patterns for their pod, contribute production-grade code, and collaborate with Software Engineers to build customer-facing AI capabilities.
As a Mobile Enabler mainly focusing on the Android ecosystem, you will own and evolve the entire Android engineering ecosystem at Mercari. The role covers Android platform and architectural solutions, performance and reliability, shared mobile modules, and engineering practices, while enabling mobile engineers to deliver experiences to Mercari users.
This role is responsible for the Experimentation Platform and Feature Flags systems across production and development, including their administration, operation, and optimization. The work includes improving access control, resource allocation, cost optimization, and usability; maintaining a scalable distributed system; scaling the product to handle 10x load; and designing and implementing Agentic Workflows.
The Senior AI Engineer will embed in a business unit engineering team to design, build, evaluate, and ship agents using in-house or open-source LLMs. The role includes taking agents from prototype to production, migrating from third-party APIs, and creating reusable implementation guidance for other teams. The position focuses on product integration rather than training foundation models or building the LLM platform.
The Software Engineer will join the Ad Product Section (APS) team and contribute to the next generation of Rakuten’s advertising platform. The role includes owning the full SDLC, designing scalable systems, conducting code reviews, and integrating AI-powered coding tools and workflows. It also involves collaboration across Product, Design, and Engineering, as well as mentoring junior engineers and interns.
The Senior Device Engineer supports the evaluation, improvement, and documentation of the corporate device environment, and is responsible for global implementation and operation of management technologies across macOS, Windows and mobile devices. The role manages client system infrastructure, deployments, application and package management, and device and client issues in collaboration with global and cross-functional teams.